RefExample.cs

class RefExample{
      static object FindNext(object value, object[] data, ref int index){
            // NOTE: index can be used here because it is a ref parameter
            while (index < data.Length){
                  if (data[index].Equals(value)){
                        return data[index];
                  }
                   index += 1;
            }
             return null;
      }
      static void Main(){
            object[] data = new object[] {1,2,3,4,2,3,4,5,3};
            int index = 0;
            // NOTE: must assign to index before passing it as a ref parameter
            while (FindNext(3, data, ref index) != null){
                  // NOTE: that FindNext may have modified the value of index
                  System.Console.WriteLine(“Found at index {0}”, index);
                  index += 1;
            }
            System.Console.WriteLine(“Done Find”);
      }
}